1

It's complex.:
Memory is a complex, poorly understood phenomenon. The fluctuations in blood pressure, blood flow and inflammation all can contribute. Often brain tissue is also destroyed during a coma which can have effects on memory. This is active area of medical research.
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Memory loss is a symptom in which a person cannot recall (remember) something that he previously learned. Some memory loss is normal, such as not remembering facts learned in school years ago but not used since then. Other memory loss is abnormal, such as that caused by Alzheimer's Dementia or other brain diseases.
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2

Memory loss:
Memory loss subsequent to coma can depend upon the reason for the coma. Some patients in a coma were placed in a medically -induced one while others may have had a disease state that caused the coma. Some patients may have sustained brain injury and the type an location of the injured brain can impact the amount of memory loss.
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4

Depends:
If the coma was brief you do not get memory loss except during coma or small time before and after coma. If the coma was prolonged and caused permanent damage to brain then memory impairment will likely be permanent and will be called dementia.
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5

Variable:
Memory loss of the events near the time of a loss of consciousness may or may not return, depending upon the severity of the injury. It is not uncommon for these memories to return over the ensuing days to weeks.
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6

Yes:
Status epilepticus is a life-threatening condition in which seizures are prolonged and affect much of the brain. Someone can be in a coma with se either because of prolonged seizures or because of meds used to stop the seizure. In either case once the seizures stop it can take time to recover. If the seizures are very prolonged damage to the brain can occur.
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7

Sorry to hear this:
I'm sorry to hear that this happened to your father. I hope your father will regain his memory or be able to carry on and make new memories. I also hope that you'll get the support you need in dealing with this difficult situation. When a patient has been in a coma for an extended period of time there are often memory problems and cognitive difficulties that can be helped through rehabilitation.
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8

Possibly:
It depends on what the reason for the coma is. You wont have any memory of the coma itself, but depending on if you had a head injury or if any part of your brain was affected, then you could have various forms of amnesia.
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Coma is a medical condition characterized by an non arousable state of unconsciousness. The brain activity seen in a comatose patient shows that being in a coma is not the same as sleeping.
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